Classification
140 - Specific philosophical schools
170 - Ethics
361 - Social problems & social welfare in general
600 - Technology
000 - Computer science, information & general works
1
200 - Religion
1
320 - Political science
1
330 - Economics
1
340 - Law
1
370 - Education
1
380 - Commerce, communications & transportation
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1